Power Commander and Velocity Stacks - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 7 (permalink) Old 03-25-2008, 10:39 AM Thread Starter
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Power Commander and Velocity Stacks

So far this year I have put new Renthal sprockets (+2 -1) D.I.D chain, Continental Sport Attack Tires, Galfer SS brake lines and a K&N filter.
I think I only have 2 more mods to do (pipe, windscreen, rear fender all done earlier) a Power Commander and Velocity Stacks
I have two questions for you all.... since I canít buy this all at once Iím thinking one this year and the other next, what one should I buy first? P.C or V.S?
And what make should I buy?
My buddy told me to do the V.S first that what when I get the P.C I only have to map it once, that kind of made sense to me what do you think?

Gary

Smoked puig windscreen
Frame sliders
FMF slip on
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post #2 of 7 (permalink) Old 03-25-2008, 12:38 PM
 
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"The acceleration of air flow into a duct is inherently a highly efficient process and the difference between even the crudest radius inlet, and the most aerodynamic shape possible is slight, amounting to no more than a few percent. The flow coefficient of a perfect entry would be 1 while the flow coefficient for a sharp edged entry would be .9. A difference of only 10% from the worst possible entrance to the best possible entrance. This does not mean that engine airflow would increase 10% as the inlet end is usually not the smallest part of the system. The actual overall gain would be much less."-Velocity Stacks by definition

To answer your question, with an aftermarket pipe and air filter. I would def remap the fuel system with a PC. Hope this helps. You should notice the difference especially low end almost immediately. Also, I noticed better performance from a BMC race filter as opposed to a K&N. Virtually the same filter, but the K&N is all rubber. It feels like the intake is getting better air flow with the BMC.
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post #3 of 7 (permalink) Old 03-25-2008, 08:59 PM
 
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Is it a full exhaust? If so I would remap it before the vs. All these mods make the zx sick don't it! I've done pretty much the same to mine and what a difference. But once you get all that done get a good perfomance clutch and a timing advancer. I did that to my 2000 zx6r and give the 750's a big fat good luck!
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post #4 of 7 (permalink) Old 03-25-2008, 10:08 PM Thread Starter
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Its a slip on FMF pipe

So a PC is the way to go then? now! next year when I get the V.S do I have to remap it (sorry never delt with PCs) or are you saying the V.S are not worth the money?

tell me more about this "perfomance clutch and a timing advancer"



Smoked puig windscreen
Frame sliders
FMF slip on
Fender eliminator kit
Galfer SS brake lines
Rental sprockets (-1 +2)
D.I.D chain
Speedohealer v4
Dynojet Power Commander III USB
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post #5 of 7 (permalink) Old 03-26-2008, 08:33 AM
 
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I guess it would depend on how much you are paying for the stacks. I wouldn't pay that much as the difference is minimal. A performance filter will do as much as some stacks.
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post #6 of 7 (permalink) Old 03-26-2008, 01:58 PM Thread Starter
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Stacks are about $250 for the 03 ZX6RR

P.C runs about $300

Smoked puig windscreen
Frame sliders
FMF slip on
Fender eliminator kit
Galfer SS brake lines
Rental sprockets (-1 +2)
D.I.D chain
Speedohealer v4
Dynojet Power Commander III USB
ZX6RRIDER is offline  
post #7 of 7 (permalink) Old 03-26-2008, 07:17 PM
 
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Pretty sure you can get PC's for 250 on this forum, or from denniskirk/kneedraggers. I would definitely go with the PC as you will notice a much better throttle response and power band with an aftermarket pipe, as it will tend to run either lean or rich without one. Either way the fuel system needs to be remapped, and I would put that priority over some stacks. I don't see a point in stacks, won't do much of a difference to a sport bike.
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